Roof Drains


At this time there are a few different kinds of roof drains and roof drain downspout in Opelika, AL and each one is a specific approach to the variety of roof styles and their drainage issues. You need to look at the kind of roof, its size, and the roof pitch to be able to select the right drain. You also may want to think about the location of the drain, what amount of rainwater is expected and safety when choosing a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravity. Flat roofs, conversely, collect water. Unless this water is guided out and away from the roof structure, it will most likely create pools that may eventually leak and the accumulated weight will eventually cause damage to the structure. That is the reason that roofs with a pitch of below 2% ought to have roof drains located at the lowest places on the roof where water pools and should be evenly spaced throughout the roof surface.

Roof Drain Types


There are several different alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater that travels by means of gravity down to the roof periphery. Gutters channel this water in the direction of downspouts which route the water flow down and away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. Scuppers can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be extended so that water is directed away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low places in the roof and attach to inner drainage pipes that route water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers which prevent debris from blocking the roof drain pipe. These kinds of drains operate via gravity funneling pooling water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage permits both air and water to go into the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

If you need more information about flat roof drain or roof drain downspout in and around Opelika, Alabama, give us a call. We'd be glad to help.